MIL-HDBK-1011/1
5.6.3
Fabrication and Construction. Where structural components are
adequately protected from the elements, connectors may be made up of bolts and
welds. After steel construction is completed, touch up all damaged shop prime
and finish coats with the identical paint material and give one or two finish
coats as necessary. As in exterior application, surface preparation includes
sandblasting or mechanical brushing to near-white steel.
Welded connections are recommended where structural components are
exposed to the elements. If bolted connections are required for either
location, economic, or structural reasons, keep them to the minimum. In any
event, specify the proper coating system.
Design connections to preclude pockets or recesses that can trap
dust, debris, and moisture. Peen and powder brush welded joints and remove
all trace of weld flux (slag). Avoid intermittent welds; require that welds
be continuous and designed to completely seal off all contact surfaces of the
structural members.
5.7
Miscellaneous Metal Items. Discussion under this section covers
all types of metal products and items not covered specifically in other
sections. It is also intended to augment other sections where similar base
metal products and items are discussed. Miscellaneous items include anchor
bolts, nuts, nails, bolts, screws, straps, connectors, fasteners, and other
items used to either secure one or more structural components together or
attach one construction item to another.
5.7.1
Corrosion Exposure. The areas adjacent to miscellaneous metal
items are often more susceptible to corrosion than their component parts, due
partly because of damage during installation. This condition is worse when
dissimilar metals are used. When exposed to aggressive elements, these areas
become the most corrosive locations on any project. Exposed architectural
items are likewise subject to significant corrosion; these include items such
as handrails, protective guards, and wire screens.
5.7.2
Corrosive Environment. In a corrosive environment, even with the
proper selection of materials, the careless installation procedures of
components can completely negate the quality of the designed project.
5.7.3
Dissimilar Metals. Galvanic corrosion, where dissimilar metals are
encountered, creates major problem areas when not properly protected. Where
dissimilar metals are specified, provide protective coating (insulation)
between the items.
5.7.4
Aluminum and Concrete. Protect aluminum placed against concrete
and cement masonry surfaces. Coat the contact surface of the aluminum with
primer and two coats of bitumen or protect by gasketing or protective tape.
Synthetic or rubber-base sealants may be used as protective barriers in
addition to the coating where applicable.
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